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Daniel O'Neil


Daniel’s private law practice crafts creative and comprehensive solutions for families, family-owned businesses, and charitable endeavors in trusts, estates, and related wealth preservation matters.
In addition to helping private clients navigate challenging times in their life, Daniel also serves all four Harris County probate courts as a court-appointed attorney ad litem in both heirship and guardianship cases as public service. Daniel also was selected in early 2018 based on qualifications to draft and annotate the master forms for Lexis Practice Advisor’s Texas trusts & estates forms that all Texas transactional lawyers rely on in drafting Wills, trusts, and ancillary estate planning documents for their clients in the LexisNexis product suite.

Daniel has been consistently honored throughout his career with a variety of awards and honors for working to address pro bono estate planning and probate legal needs for the region’s most vulnerable and disaster-impacted families. October 1, 2018 was named Daniel O’Neil Day in the City of Houston by proclamation of Mayor Sylvester Turner for Daniel’s volunteer service to 13 families impacted by the disaster of Hurricane Harvey with pro bono representation in probate court, replacing lost or flooded estate planning documents, and administrative matters with FEMA.

Daniel serves as an invited speaker at various professional and community gatherings around the state on common law marriage issues in probate since Obergefell, as well as other estate planning topics. A motorcycle enthusiast and investor in Harley-Davidson, Inc., Daniel enjoys supporting American-made businesses.

If you need an attorney in Houston, contact Stepp & Sullivan, P.C. at (832) 501-2823 today.


  • Southern Methodist University
    • Undergraduate
  • University of Oxford, University College (“Univ.”)
    • International Studies certificate program
  • South Texas College of Law
    • J.D.
  • University of Houston Law Center
    • Tax LL.M

Bar & Admissions

  • State Bar of Texas
  • United States District & Bankruptcy Courts for the Southern District of Texas
  • United States District Court for the Northern District of Texas
  • United States Tax Court
  • United States Court of Appeals for the Fifth Circuit
  • Supreme Court of the United States


  • Pro Bono College – State Bar of Texas
  • Designated a “Probate Master” by the Houston Volunteer Lawyers

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